Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net (loss) income	$ (204,516)	$ 83,072	$ 87,362
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,448	43,176	40,389
Asset impairments	255,116	0	0
Interest accretion of convertible notes discount	11,535	10,662	9,854
Financing costs amortization	1,290	1,392	1,306
Employee share-based compensation expense	11,325	9,420	9,989
Unrealized foreign currency transaction loss (gain)	78	(1,606)	(3,388)
Deferred income tax benefit	(24,403)	(248)	(1,607)
Other non-cash operating activities	737	(170)	4,514
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	7,195	43,079	(69,287)
Inventory	11,988	(8,150)	(12,679)
Unbilled contract revenues and other assets	12,250	(51,467)	(10,875)
Accounts payable and other liabilities	(16,293)	11,660	(5,259)
Deferred income taxes	(51)	(3,690)	(793)
Customer advances and billings in excess of contract revenue	(9,710)	(18,413)	10,137
Net Cash Provided By Operating Activities	101,989	118,717	59,663
INVESTING ACTIVITIES
Capital expenditures	(47,039)	(62,135)	(72,585)
Payments for China land use rights	(11,043)	0	0
Government grants	8,650	0	0
Proceeds from sale of assets	425	1,593	569
Acquisition of businesses, net of cash acquired	(24,517)	(11,943)	(2,965)
Net Cash Used In Investing Activities	(73,524)	(72,485)	(74,981)
FINANCING ACTIVITIES
Borrowings on revolving credit facilities	68,827	88,819	214,623
Repayments on revolving credit facilities	(67,196)	(87,162)	(211,403)
Payments on long-term debt	0	(68,437)	(3,750)
Payments for debt issuance costs	0	(1,321)	0
Payment of contingent consideration	(611)	(741)	0
Proceeds from exercise of stock options	486	763	5,335
Excess Tax Deficiency from share-based Compensation, Financing Activities	(890)
Excess tax (deficiency) benefit from exercise of stock options		1,859	6,673
Common stock repurchases	(948)	(3,367)	(2,002)
Dividend distribution to noncontrolling interest	(120)	(1,206)	(1,369)
Proceeds from (Payments for) Other Financing Activities	(156)	0	0
Net Cash (Used In) Provided By Financing Activities	(608)	(70,793)	8,107
Effect of exchange rate changes on cash	(7,805)	(9,128)	3,058
Net increase (decrease) in cash and cash equivalents	20,052	(33,689)	(4,153)
Cash and cash equivalents at beginning of period	103,656	137,345	141,498
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 123,708	$ 103,656	$ 137,345